SOME SERIOUS global warming: “If nature is left to its own devices, about 7.59 billion years from now Earth will be dragged from its orbit by an engorged red Sun and spiral to a rapid vaporous death. That is the forecast according to new calculations by a pair of astronomers, Klaus-Peter Schroeder of the University of Guanajuato in Mexico and Robert Connon Smith of the University of Sussex in England. . . . Dr. Smith called the new result ‘a touch depressing’ in a series of e-mail messages. But ‘looked at another way,’ he added, ‘it is an incentive to do something about finding ways to leave our planet and colonize other areas in the galaxy.'” I guess we’d better make sure we’ve moved by then.